Feed mechanism for sewing-machines.



No. 684,266. Patented Oct. 8, I90l. H. A. KLEMM.

FEED MECHANISM FOR SEWING MACHINES.

(Applicntion filed Feb. 15, 1901.)

2 Shuts-Sheet I.

(No Model.)

FIGLZ.

ATTORN EY No. 684,266. Patented Oct. 8, 190i.

' H. A. KLEMM.

FEED MECHANISM FOR SEWING MACHINES.

(Application filed Feb. 15, 1901.)

2 Sheets-Sheet 2.

(No Model.)

INV NTOR BY v WITNESSES:

' ATTORN EY 4 shaft.

UNITED STATES PATENT OFFICE.

HERMANN A. KLEMM, OF NEW YORK, N. Y.

FEED MECHANISM FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 684,266, dated October 8, 1901.

Application filed February 15, 1901. Serial No. 47,466. (No model.)

T0 (tZZ whom it ntcty concern:

Be it known that I, HERMANN A. KLEMM, a citizen of the United States of America, and a resident of New York city, county and State of New York, have invented certain new and useful Improvements in Feed Mechanism for Sewing-Machines, of which the following is a specification.

My invention consists of improvements in differentiating feed apparatus, the object of which is to feed knit or other elastic goods that are liable to stretch under the action of the feed devices and pucker after leaving said devices, so that such result will be avoided, ashereinafter described,reference being made to the accompanying drawings, in which Figure 1 is a side elevation of my improved feed apparatus in the preferred form of construction with the work-plate, main shaft, and pivot of the rocking lever in section. Fig. 2 is a plan View of the apparatus of Fig. 1, except the presser and work-plate. Fig. 3 is a detail showing some of the parts of Figs. 1 and 2 in side elevation and a section of the main shaft. Figs. 4, 5, and 6 represent side elevations of the feed apparatus with modifications. Fig. 7 is an elevation of the apparatus of Fig. 4 as seen looking in the direction indicated by the arrow pointing toward said figure. Fig. 8 is a side elevation of the presser with a part in section. Fig. 9 is a front elevation of the presser, and Fig. 10 is a detail of a connecting-rod shown in Figs. 5 and 6.

Arepresents the work-plate; 0., the presser, b, the feed-dog; o, the bar for imparting the reciprocating movements to the feed-dog; d, the rock-lever for operating the reciprocating bar; e, the eccentric, and f the connectingrod for operating the rock-lever. The eccentric e is mounted on the main shaft g, and

the rock-lever dis supported on a stationary pivot h, back of and parallel with the main The feed-dog b is attached to a bearer 2', riding on an eccentric j, mounted on the main shaft 9 near the eccentric e, that operates the rock-lever cl, said bearer having a yoke 7t and the eccentric having a box Z, Working in said yoke for better efiect in respect of wear. The reciprocating bar 0 also rides at the front end on an eccentric m by means of a yoke n and a box 0. The feed-dog Z) has a short extension 3 along the feed-line, which is pivoted at q to jaws 8, extending upward from the upper edge of the bar 0. The jaws 5 may be adjustable vertically in their connection with the bar 0, as indicated at 9 and 10, Figs. 1 and 3. The main shaft turnsin the direction indicated by the arrow under Fig. 1. The eccentricmis set slightly in'ad Vance of the eccentric j on the main shaft, so that when the feed-dog, having been raised by the two eccentrics m and j to grip the work throughout their length is compensated in this arrangement by the slight overfeed of the hinder part of the dog relatively to the feed of the forward part in consequence of the slip of the dog on the work where the grip is relaxed. In connection With'this differentiating action of the feed-dog I prefer to pivot the resser-plate t to the toe of the presserfoot a at u, so that it will bear fiat on the face of the feed-dog when so rocking during the time the face of the feed-dog is higher than the throat-plate. The presser-plate is wider than the slot in the throat-plate in which the dog works, and this is prevented from continuing the pressure-after the forward part of the dog falls below the surface of the work-plate. The yoke bearings of the feed-dog bearer and the dog-reciprocating bar permit the necessary reciprocating movements for effecting the feed of the work along the needle. The rod f is connected to the rock-lever d in a sloto for the requisite adjustments for vary ing the lengths of the stitches. In'Figs. 4 to 7, inclusive, practically the same means are represented for so operating the feed-dog, though modified in some of the details-that is, the feed-dog has a pivot connection 00 with the feed-bar and a connection with an eccentric on the main shaft, whereby together with said connection of the feed-bar both the feed motions and the differentiating-grip motions are eifected. In all these figures there is the same feed-bar 0, having a yoke '12 embracing an eccentric m on the main shaft 9 and connected with the rock-lever d, operated by the eccentric e and connecting-rod f. In Fig. 4: the feed-dog 2 is carried on a bearer pivoted at w to one side of the bar 0, so as to rock in the plane of the feed-line, and having a yoke extension n below the pivot and embracing an eccentric j on the main shaft g, which rocks the dog and elfects relaxation of the grip on the work at the same time relatively to the feed movement as the apparatus of Figs. 1 and 3 does. In Figs. 5 and 6 the feeddog 3 has its bearing-support on the feed-bar c by a pivot-joint so, at or near its hind end relatively to the feed movement, on which said dog turns slightly up and down for effecting the differentiating grip, said dog being connected forward of the pivot 92' by a rod y with an eccentric 7' on the main shaft gto swing the dog. The eccentric-rodsy may be adjustable as to length as indicated at s or in any other approved way for adjusting the dog as may be required. When the pivot or connecting the dog with bar c is located forward of the rear end of the dog, as in Fig. 6, the said end has slight rising motion when the forward end descends, same as in Figs. 1 to 4, inclusive, thus increasing the hinder grip for more positively over-feeding the part of the work there gripped, while the relaxation of the grip forward allows the part of the work there gripped to advance less positively, and thus the stretching of the goods as when fed by a dog not having such differentiating action is avoided.

What I claim as my invention is- 1. The combination with the main shaft, of the feed-dog-operating bar, yoke of said bar and the eccentric coupling it with the main shaft for effecting the rising and falling movements of the bar, a feed-dog having a pivoted connection with said feed-bar, and an ecc'eiP" tric on the main shaft coupled with the dog for differentiating the movements of the feed- 7 7 dog vertically, the eccentric on the main shaft, its connecting-rod, and the rock-lever therewith connected and having the rear end of said bar connected with it for reciprocat V ing said feed-bar.

2. The combination with the main shaft, of the feed-dog-reciprocating bar, yoke of said bar and the eccentric coupling it with the" main shaft for effecting the rising and fall ing movements of the bar, a feed-dog, a bearer for said dog, an eccentric on the main shaft- V 6o with which said bearer is coupled by a yoke, a pivot connection of a forward extension of the dog with the dog-reciprocating bar forward of the dog, a rock-lever with which the r V forward end of the dog-reciprocating bar is connected, and the eccentric on the main February, 1901.

HERMANN A. KLEMM. YVitnesses:

C. SEDGwIoK, J. M. HOWARD.

i shaft, and rod connecting it with the rock lever for reciprocating the feed-dog, said' 

